Project Manual

**smithy** · Sunday 28th February 2010, 21:14

Originally Posted by Wobbly Dave

James - really pleased about these results. Are these different to the ones I saw when you were at Hamish's that day?

i think he had alot more power and torque now mate hows yours going with all your shiny bits lol

**Wobbly Dave** · Sunday 28th February 2010, 21:37

Thread update is imminent

- Peter cometh and bring goodly things forth from Sweden.

**bonelorry** · Sunday 28th February 2010, 21:37

Originally Posted by Wobbly Dave

Guess is indeed the word.

Whats your 2 penneth then wobbly???

**Wobbly Dave** · Sunday 28th February 2010, 21:41

How do you work out what the transmission loss - at 15%, when at your own words you said it was a complete guess.

**bonelorry** · Sunday 28th February 2010, 21:46

Originally Posted by Wobbly Dave

How do you work out what the transmission loss - at 15%, when at your own words you said it was a complete guess.

So what do you think then???

How much loss as a percentage would you say is a typical amount on a FWD car?

**Wobbly Dave** · Sunday 28th February 2010, 21:54

one based on the graph above?

**bonelorry** · Sunday 28th February 2010, 21:58

Originally Posted by Wobbly Dave

one based on the graph above?

No as we both know there is no way on earth the M59 box is that efficient.....Not unless its got a straight cut gear set fitted.

Going on that graph there is only about a 6% to 7% transmission loss from the flywheel to the wheels its just not possible.

Taken from good old Wikipedia....

Brake horsepower (bhp) is the measure of an engine's horsepower without the loss in power caused by the gearbox, alternator, differential, water pump, and other auxiliary components such as power steering pump, muffled exhaust system, etc. Brake refers to a device which was used to load an engine and hold it at a desired RPM. During testing, the output torque and rotational speed were measured to determine the brake horsepower. Horsepower was originally measured and calculated by use of the indicator (a James Watt invention of the late 18th century), and later by means of a De Prony brake connected to the engine's output shaft. More recently, an engine dynamometer is used instead of a De Prony brake. The output delivered to the driving wheels is less than that obtainable at the engine's crankshaft

wheel horsepower (whp) are the brake horsepower converted to useful work. In the case of a road vehicle this is the power actually turned into forward motion as measured on a chassis dynamometer. Power available at the road is generally 10% to 20% less than the engine's actual bhp crankshaft rating due to vehicle related parasitic losses, much of which is due to the vehicle's rubber tires rather than true transmission losses

Obviously RWD and 4WD losses are greater for obvious reasons such as differentials and transfer boxes etc etc But then you already know that.

My guess of 15% wasnt that far out.

**Wobbly Dave** · Sunday 28th February 2010, 22:12

But you're just throwing out aspertions based on Wiki facts and a hunch - when the graph quite clearly shows good efficients results for James' efforts.

**bonelorry** · Sunday 28th February 2010, 22:14

Originally Posted by Wobbly Dave

But you're just throwing out aspertions based on Wiki facts and a hunch - when the graph quite clearly shows good efficients results for James' efforts.

Like i said to james the power and torque figures are very good and he has done very well with the conversion etc

I just dont buy the WHP figure for one minute

**Wobbly Dave** · Sunday 28th February 2010, 22:20

And that would be because...

**bonelorry** · Sunday 28th February 2010, 22:26

Originally Posted by Wobbly Dave

And that would be because...

See post 107 2nd paragraph down and ill leave it at that as im bored already.

**Jamest5r** · Monday 1st March 2010, 00:09

Originally Posted by Wobbly Dave

James - really pleased about these results. Are these different to the ones I saw when you were at Hamish's that day?

Hi Dave, about the same bhp but better torque overall so nicer to drive...that's what's it all about.

As for the discussion above all rollers/graphs are subjective but if i use the same one all the time i know where i stand, i know its just numbers but its all a laugh at the end of the day, i could of got 300bhp but the car would'nt of been as good to drive through the power range, its the torque for me not the end bhp or whp

**danny-R** · Monday 1st March 2010, 07:30

well done james mate. it's looking good to me.
i think you have done well to say you're using a 16t.
Round 2 at york

?

**smithy** · Monday 1st March 2010, 08:22

Originally Posted by cgrextreme

See post 107 2nd paragraph down and ill leave it at that as im bored already.

on what you are saying mate is the whp could be right because that is what the rr reads at the end of the day so his fly bhp should be higher more like nearly 300 bhp yippee.lol .im going to be using the same rr on my car so the comparion should be right then with mine and james and anybody else that uses the same rr .

**smithy** · Monday 1st March 2010, 08:28

Originally Posted by danny-R

well done james mate. it's looking good to me.
i think you have done well to say you're using a 16t.
Round 2 at york

?

im looking forward to that danny i think it should close or he might even beat you lol.but dont worry it will be on camera for everyone to see lol

**RollingThunder** · Tuesday 2nd March 2010, 13:06

Nice job that. I'd consider doing the auto-manual conversion on my 850R if/when my autobox dies, but I must admit to being VERY apprehensive about it. It'd be very easy to let costs spiral out of control.

Good to see that its worth the effort though

**Jamest5r** · Tuesday 2nd March 2010, 19:45

Originally Posted by danny-R

well done james mate. it's looking good to me.
i think you have done well to say you're using a 16t.
Round 2 at york ?

Looking forward to it mate the best my car would do before was 15.1 and as much as it's a laugh it's always nice to win just ask the Mrs lol, going to avon on the 4th so ill see how it goes then.

**Jamest5r** · Friday 16th April 2010, 19:59

Well after having 6 weeks of fun in my car ive killed it

i guess this is the chance you take with a 2nd hand engine and pushing it to the limit, piston rings failing and build crank pressure and blue smoke out the back. So the bitch is out and being rebuilt next week with new pistons and rings so at least when it goes back in it will be sorted. Some pics for you.... you can see the burn on top of cylinders 1 and 5 and Smithy lurking in the background lol cheers for your help once again your beer tokens are piling up.
Also anyone know where to get pistons and rings Rufe wants £385

going to be bloody expensive week or two.

Cheers

**p fandango** · Friday 16th April 2010, 21:01

damn. How come that happened, its not a very common problem? (thought the piston were good for upto 400bhp?)

**Tomcat** · Friday 16th April 2010, 21:05

Oh bugger, bad luck James, still if you get it rebuilt properly then it should be good for another 200k. What is it with Smithy, are you and him joined at the hip?,lol.